#include<iostream> 
using namespace std;

namespace m1
{
  char *user_name="myown1";
}

namespace m2
{
  char *user_name="myown2";
}

int main()
{
  cout<<"Hello,"<<m1::user_name<<"goodbye"<<endl;
  cout<<"Hello,"<<m2::user_name<<"goodbye"<<endl;
  system("pause");
  return 0;    
}
